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Well I've used their top tube bag and standard frame bag and I find them very good. The only reserve I'd emit is that the frame bag is optimized for MTB frames but that's not a surprise - and not a concern if you ask for a custom one (but well I ordered what was on sale). I'll certainly consider them when looking for stem/handlebar feed bag and a custom frame bag.
(And the zip handles glow in the dark)
Yes, Alpkit is quite shitty quality IMO